Frederick l



'March 3, 1931. CREAGER 1,794,673

SPARK PLUG COVER 7 Filed July 26, 1923 Had INVENTOR fiFDE/?/6KL. @5965)? Patented Mar. 3, 1931 UNITED STATES PATENT OFFICE FREDERICK I). CREAGER, OF BELOIT, WISCONSIN, ASSIGNOR T FAIRBANKS, MORSE & (10., OF CHICAGO, ILLINOIS, A. CORPORATION OF ILLINOIS SPARK-PLUG COVER Application filed m 26,

M invention relates to. improvements in spar plug covers. I

It has for its object the prevention of short circuits in a spark plug exposed to rain and moisture, and is advantageous in that it leaves the terminal of the plug and the conductor to the plug free and unobstructed, thus making for greater accessibility, is flexible and therefore adaptable to all types of .10 plugs, provides for the controlling of the moisture drip, and is simple and economical to manufacture being of one piece and of one material.

Referring to the drawings, Fig. 1 is a plan view of m invention showing it attached to a spark p ug. Fig. 2 is a sectional view on line 22 shown in Fig. 1. Fig. 3 is a side view of my invention alone, showing it removed from the spark plug.

Referring by numerals to the drawings, the cover, 5, is preferabiy cylindrical or bell shaped, as shown, and is constructed of a suitable, flexible insulating material, such, for example, as rubberv or a compound or com osition thereof and extends below the insu ating column, 13, of the plug, 8.

In use the cap or cover is flexible enough to be forced over the projections, 6 and 7 of the plug, 8, forming a waterproof joint between said cover and said plug and leaving the terminal, 9, and conductor, 10, free and exposed. The yertical ribs or projections, 11, conduct the rain or moisture to the points, 12, from which the drops of water can collect and-fall. By the use of these ribs or reinforces I am able to secure a cover using less material and at the same time afford greater flexibility. As shown in the drawings the ribs 11 at the neck portion of the shield are spaced apart substantially the width of a single rib. I do not, however, limit myself to ribs in particular, for indentations or channels would produce the same effect, the

portions of the cover situated between the channels serving as reinforces and the channels acting as guides for the moisture flow.

I prefer to have my cover to extend downward far enou h to fully protect the plug against water alling on the insulation and,

50 at the same time, keep it from interfering 1923. Serial No. 653,963.

with the operator in screwing the plug in place or removing it.

Having fully described my invention, what I claim as new and desire to obtain by Let'- ters Patent is:

1. A spark plug protecting shield comprising a cup-shaped member provided with a neck portion having an opening for reception of a spark plug porcelain and having an enlarged end terminating in a free edge, said member provided on its outer surface with upstanding ribs extending from said neck portion to the free edge of said member and terminating in projections below said edge to control and direct moisture collecting on said member.

2. A spark plug shield comprising a cupshaped member of flexible elastic insulating material provided with a neck portion for surrounding the porcelain of a plu and a skirt portion said member provide on its outer surface with a plurality of upstanding moisture controlling ribs, the spacing of said ribs at the neck portion being substantially I the width of a rib, said ribs extending to the free edge of said skirt and terminating in drip control projections extending below said free edge.

' FREDERICK L. CREAGER. 

